JPH06145739A - Method for repairing peripheral deteriorated part of blast furnace tap hole - Google Patents

Abstract

PURPOSE:To eliminate the severe environment to human bodies in the repair of the peripheral part of a blast furnace tap hole. CONSTITUTION:A gap 3 having a tray-shaped form on a front side is mounted to a cylindrical tip 2 of a mud gun and the form of this cap 3 is pressed by the mud gun 1 to peripheral refractories 15 of tap holes to cover the tap holes 13, 14. A packing material 16 to be used for closing the tap holes is force-feeded from the inside of the mud gun 1 into the space between a recess 14 of the tap hole and the form. This packed part 17 is press-fixed and molded by the cylindrical tip 2 of the mud gun from which the cap is removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of repairing a deteriorated portion around a blast furnace tap hole.

[Prior art]

[0002]

2. Description of the Related Art In general, casting bed equipment for extracting the molten slag that has fallen into the basin of a blast furnace from the taphole to the outside of the furnace includes a taphole, an opening machine for opening the taphole, a mud gun for closing, It is composed of gutters, etc., for pouring molten iron and slag. The tap hole is opened after a time when the melting inside the blast furnace is sufficiently advanced and a predetermined amount of tap metal is possible, and is closed after tapping the predetermined amount.

In the process of repeating the blockage of the opening,
Or, in the normal melting process in the blast furnace, cracks on the taphole surface of the blast furnace, rough surface, partial dropout of surface forming material, etc. due to large pressure fluctuations due to gas pressure rise around the taphole or blockage. If this occurs, the filler leaks from between the tip surface of the tip of the mud gun barrel and the tap hole surface when the tap hole is closed. Further, since the mud gun is repeatedly pressed against the taphole, a large dent is formed on the taphole surface.

Conventionally, in such a case, the tap hole is disassembled by a rotary blade type chamfering device or a breaker, and a refractory for repair is manually applied to the same part, or a frame is formed in the same part and the refractory is poured and required. The blast furnace taphole is formed after a drying process for a long time.

[0005]

However, since the repair work of the deteriorated part of the taphole at the blast furnace is a work near the taphole, the human body is exposed to high heat and gas, which is dangerous and heavy labor.

On the other hand, there is a blast furnace tap hole frame forming method disclosed in Japanese Patent Laid-Open No. 57-9809. As shown in FIG. 4, a mold frame 44, which spreads backward in a skirt shape from the tip of the mud gun 33, is set at the tip of the mud gun 33, and the mold 44 is attached to the exposed brick surface 35 around the tap hole 34. Face the wall at a fixed position when the tap hole is closed
This is a method in which a fluid amorphous refractory 49 containing SiO, Al2 O3 or the like as a main component is poured between the skirt and the skirt-shaped frame 44 and then solidified, and the shaping step can be eliminated.

However, in the case of this method, (1) it is necessary to pour the flowable refractory between the wall surface 35 and the skirt-shaped mold 44 by using the pouring device, and (2) the peripheral wall surface. It is necessary to set a large formwork to cover it. Therefore, the heavy labor associated with these tasks still remains.

An object of the present invention is to eliminate the above-mentioned drawbacks, eliminate a harsh environment for the human body, and more easily repair a deteriorated part of the blast furnace tap hole, thereby repairing a blast furnace tap hole peripheral deteriorated part. To provide.

[0009]

In order to achieve the above object, a method for repairing a deteriorated portion around a blast furnace taphole according to the present invention is to attach a cap having a dish-shaped frame on the front side to a tip of a mud gun in a detachable manner. , Press the mold of this cap against the refractory around the taphole with a mud gun to cover the taphole,
The filling material used for closing the taphole is pressed into the space between the depression and the mold from the mud gun, and the filling part is pressure-molded with the tip of the mud gun with the cap removed, and the required drying process is performed. After that, it is solidified and used as a blast furnace tap hole.

[0010]

[Function] The cap attached to the tip of the mud gun is formed as a dish-shaped frame on the front side, and when this cap is pressed against the refractory around the taphole, the depression of the taphole has the dish-like shape. It becomes a closed space covered with a formwork. The filler is extruded into the mud gun. That is, instead of the conventional repairing method by hand painting or pouring with a specific refractory for taphole repair, the filler itself used for taphole closing is used as a repair material, There is no need for a separate pouring device or pouring work near the taphole as in the case of FIG. Further, there is only the work of attaching the cap to the tip of the mud gun, and this can be done at the retracted position of the mud gun, which is extremely easy and safe and can relieve the worker from high heat, dust and heavy muscle work.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. FIG. 3 shows a cap 3 attached to the barrel tip 2 of the mud gun 1 as shown in FIG. The cap 3 has a mold 4 having a dish shape as a whole, which is open to the front surface side, and an attachment portion 5 which is formed on the rear surface thereof and attached to the tip 2 of the mud gun.

In this embodiment, the mold 4 has a cylindrical mold space 6 and a flange 7, and the size of the mold space 6 is slightly larger than the tip 2 of the mud gun 1 having a diameter. ,
The depth is set so that the necessary and sufficient bulge remains after filling the mud. Further, a mold release material layer 6a made of a material such as Teflon that easily slips is provided on the inner surface of the mold space 6. However, instead of providing the coating layer 6a in advance, a release agent such as oil may be applied each time it is used.

On the other hand, the mounting portion 5 is formed by projecting two rings 8 and 9 on the rear surface of the mold 4 so as to form a double ring, and forming a fitting space portion 10 between the two rings. The fitting space portion 10 is a fitting portion that receives the edge portion (thickness portion) of the mud gun cylinder tip 2 and fixes the cap 3 to the fitted mud gun cylinder tip edge portion so as not to separate from the mat gun gun tip end 2. A fixing screw 11 is screwed into the installation ring 8 from the outside in the radial direction. Further, the inner space of the inner protruding ring 9 is communicated with the mold space 6 by the through hole 12, thereby forming a supply passage for supplying the mud from the mud gun 1 into the mold space 6. The fitting space portion 10 between the protruding rings 8 and 9 has a dimensional accuracy such that when the edge portion (thickness portion) of the mud gun barrel tip 2 is fitted and inserted, the both are almost completely sealed. Have

Next, a repairing method using the cap 3 will be described. (1) First, the cap 3 is set on the barrel tip 2 of the mud gun 1 as shown in FIG. That is, the edge portion of the mud gun barrel tip 2 is fitted and inserted between the protruding rings 8 and 9 (fitting space portion 10) of the cap mounting portion 5, and the fixing screw 11 is tightened to fix the cap 3 to the mud gun barrel tip 2. At that time, a seal member is interposed as needed on the bottom of the fitting space portion 10 between the protruding rings 8 and 9 or on the outer periphery of the mud gun barrel tip 2.

(2) The mud gun 1 is swung from the retracted position, and the cap 3 together with the mud gun 1 is tapped 1
3, and the cap 3 is pressed against the refractory material 15 around the taphole with a mud gun. In this case, the cap 3 is positioned so that the mold 4 covers the recess 14 that is the deteriorated portion of the tap hole 13. As a result, the peripheral edge of the cap 3, that is, the frame flange portion 7, is pressed against the refractory material around the taphole by the force of the mud gun body as shown in FIG.

(3) The mud 16 used for closing the tap hole is pushed out from the inside of the mud gun through the through hole 12 by an extruding device (not shown) included in the mud gun main body, and the depression 14 of the tap hole and the cap 3 And fills the space formed by the mold space portion 6 and. Since the bottom of the mold space 6 is located outside the surface of the refractory material 15 around the taphole, the mud 16 is filled more than the recess 14 which is the deteriorated portion of the taphole 13.

(4) The cap 3 is retracted together with the mud gun 1. At this time, the inner surface of the mold space 6 of the cap 3 is coated with a release material layer 6a such as Teflon, so that the gap 3 is easily released from the mud of the filling portion 17. After the gap 3 is released from the mold, a raised portion complementary to the mold space 6 remains on the filling portion 17.
Since the cap 3 is fixed by the screw 11, there is no concern that the cap 3 will fall out of the tip 2 of the mud gun when the mud gun 1 is retracted.

(5) The mud gun 1 is swung to the retracted position and retracted, the cap 3 is removed, and then the mud gun barrel tip 2 is pressed against the mud protrusion on the filling portion 17 as shown in FIG. Form a surface. After that, it undergoes a drying process for the required time to solidify it and make it into a repaired blast furnace tap.

[0019]

As described above, according to the present invention, the following excellent effects can be obtained. 1) Since the filler itself used for closing the taphole is used as a repair material, a separate pouring device is unnecessary.

2) Since there is no need for manual work such as pouring near the taphole, handling and setting of forms and jigs, it is possible to relieve workers from high heat, dust, and heavy work, and repair It is possible to make the work comfortable or save labor.

3) The work of attaching the cap to the tip of the mud gun may be performed at the retracted position of the mud gun, which is extremely simple and safe.

[Brief description of drawings]

FIG. 1 is a diagram showing a filling step of a repairing method according to an embodiment of the present invention.

FIG. 2 is a diagram showing a pressure-bonding molding step of a repairing method in one embodiment of the present invention.

FIG. 3 is a view showing a structure of a cap attached to the mud gun in FIG.

FIG. 4 is a diagram showing a conventional repair method.

[Explanation of symbols]

 1 Mad gun 2 Mad gun barrel tip 3 Cap 4 Form 5 Mounting part 6 Form frame space 6a Release material layer 7 Flange part 8, 9 Ring 10 Fitting space part 11 Fixing screw 12 Through hole 13 Outlet hole 14 Deterioration of outlet hole Part hollow 15 Refractory around taphole 16 Mud (filler) 17 Filling part

Claims (1)

[Claims] 1. A mud gun having a dish-shaped frame on the front side, which is detachably attached to the tip of a mud gun, and which is pressed against the refractory around the tap hole by the mud gun to cover the tap hole. The filler used for plugging the taphole is pressed into the hollow of the taphole and the space between the molds, and the filling part is pressure-molded with the tip of the mud gun with the cap removed. A method for repairing a deteriorated area around a blast furnace tap hole, which comprises solidifying this to form a blast furnace tap hole.